[opensuse-autoinstall] How to debug a failed Autoyast install of a Factory-Xen DomU?

Installing an OpenSuse 11.1 DomU, with autoyast= invoked in the DomU's
.cfg, works just fine.

Installing an OpenSuse Factory DomU, the install launches, and
proceeds to some random , late-stage package install (@ ~ 80-90%
complete, in each of 4 attempts), then just hangs -- taking the Dom0
with it. All connections are dropped, and a system reboot is
required.